JP2917441B2 - Cameras that use film cartridges - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera using a film cartridge, and more particularly to a camera configured to feed a film from the film cartridge during auto initial loading.

2. Description of the Related Art Conventionally, a camera provided with an auto initial loading mechanism uses a film cartridge capable of feeding a film from a cartridge, which is a container thereof, so as to be compatible with the mechanism. In a camera using such a film cartridge, the film fed from the film cartridge is guided between the pressure plate and the film contact surface of the camera body, and is fed to the take-up reel.

By the way, since the film itself is wound and stored on a spool in the cartridge, the film sent out from the cartridge has a curl with a curl. Therefore, if there is, for example, an opening for a sprocket or a delivery roller at a position facing the photosensitive surface side of the film on the film feeding path, that is, at a position facing the front side of the film, the leading end of the curled film is fed. There is a danger of getting stuck in this opening or getting caught in the middle of the opening. In addition, if it does not come out while being fitted, the feeding load becomes excessive and the feeding becomes impossible.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problems, and to provide a camera using a film cartridge, which can reliably send and guide a film from the film cartridge.

Means for Solving the Problems In order to achieve the above object, according to the first aspect of the present invention, the peripheral portion of the opening formed on the film feeding path on the front side in the film feeding direction is formed as an inclined surface. In the invention of Item 2, the peripheral portion is formed in a plane shape of a hypotenuse.

That is, the camera according to the first aspect of the present invention has a winding shaft for winding a film and a film entrance and exit, and accommodates the film wound on the winding shaft in a light-shielded state, and a film on the winding shaft. In a camera using a film cartridge in which a film is pushed out from the entrance by rotation in a winding loosening direction, the camera has an opening formed along a film feeding path, and a peripheral portion defining the opening is formed. A peripheral portion located on the front side in the film feeding direction is formed to have a cross-sectional shape formed by an inclined surface approaching the film feeding path toward the front in the film feeding direction, and from the film feeding path to the inside of the opening. The front end portion of the film fitted into the film is returned on the film feeding path along the inclined surface.

The camera according to the second aspect of the present invention has a winding shaft for winding a film and a film entrance and exit, and accommodates the film wound on the winding shaft in a light-shielded state, and a film on the winding shaft. In a camera using a film cartridge in which a film is pushed out from the entrance by rotation in a winding loosening direction, the camera has an opening formed along a film feeding path, and a peripheral portion defining the opening is formed. A peripheral portion located on the front side in the feeding direction of the film is formed in a planar shape having an oblique side inclined with respect to the film feeding direction, and the film fitted into the opening from the film feeding path. Is returned to the film feeding path along the oblique side.

According to the configuration described above, the film that is fed from the film cartridge and moves on the film feeding path fits into the opening if the leading end moves at the opening. As the tip further reaches the leading edge of the opening in the direction of film advancement while proceeding further,
The leading end of the film is guided by its inclined surface or hypotenuse, exits from the opening, and returns to the film feeding path. Therefore, even when the leading end of the film has a curl in the curl shape, it is possible to effectively prevent the leading end from being stuck in the opening and not coming off, thereby making it impossible to feed the film.

Embodiment Hereinafter, an embodiment according to the present invention will be described in detail with reference to FIGS.

In the camera using the film cartridge according to the present embodiment, as shown in FIGS. 1 to 3, between the film cartridge storage chamber 7a and the take-up reel storage chamber 7b of the camera body 7 and as the first guide wall. 7m film contact surface
On the upper and lower sides of the exposure opening 7c, engagement projections 7j, 7j extending in a guide rail shape are formed so as to protrude, and the upper and lower engagement projections 7j, 7j are engaged with the exposure opening side. The guide rail surfaces 7k, 7k protrude and are formed substantially parallel to the projections 7j, 7j.

The guide rail surfaces 7k, 7k are lower than the engagement projections 7j, 7j, and contact the front surface of the film 3 to guide the film moving direction. As shown in FIG. 3, the vicinity of the engagement projections 7j, 7j on the film cartridge storage chamber 7a side is formed as inclined portions 7e, 7f which are inclined so as to expand in the vertical direction, respectively. The leading end of the film 3 to be fed out is smoothly guided in the film moving direction between the engaging projections 7j, 7j by the inclined portions 7e, 7f.
In addition, as shown in FIG. 1, in the vicinity of the film cartridge storage chamber 7a of the engagement projections 7j, 7j, the slope is expanded so as to spread in the thickness direction of the film 3 toward the film cartridge storage chamber. The guide surfaces 7d and 7d are respectively formed so that the film 3 can be smoothly fed from the entrance 1a of the film cartridge 1. Further, as shown in FIGS. 6 and 7, a rectangular opening 7g extending along the film moving direction is formed on the lower side of the guide rail surface 7k on the film cartridge side. A part of the film feed roller 4 is inserted so as to be able to contact the film 3. As shown in FIGS. 6 and 7, the opening 7g has a peripheral portion located on the front side with respect to the moving direction of the film 3 formed as an inclined surface in a sectional shape. Therefore, even if the leading end of the film 3 has a curl in the curl shape and once enters the opening 7g, the leading end rises on the inclined surface and exits from the opening 7g with the feeding of the film 3. Therefore, it is possible to return to the regular film contact surface 7m. The same configuration as the inclined surface of the opening 7g is also applied to the exposure opening 7c as shown in FIGS. 1 and 2 in this embodiment. 3a is a sprocket hole of the film 3. The film cartridge rotation stopper 9 in the film cartridge storage chamber 7a is attached to the film cartridge 1 in the film cartridge storage chamber 7a.
For positioning the entrance 1a at a predetermined position.

The film cartridge 1 has a winding shaft 1b for winding the film 3 and a film entrance 1a. The film cartridge 1 accommodates the film 3 wound on the winding shaft 1b in a light-shielded state. The film 3 is pushed out from the entrance 1a by the rotation of the film 1b in the loosening direction. When the film cartridge 1 is mounted in the film cartridge accommodating chamber 7a of the camera body 7, the film cartridge 1 is urged upward and rightward in FIG. Preferably, the outer peripheral surface contacts the inner peripheral surface of the film cartridge storage chamber 7a.

On the other hand, a back cover 8 arranged with respect to the camera body 7
A pressure plate 6 as a second guide wall is disposed opposite to the film contact surface 7m of the camera body 7. A lid 8a for a film cartridge storage chamber and a lid 8b for a take-up reel storage chamber are disposed in the film cartridge storage chamber 7a and the take-up reel storage chamber 7b of the camera body 7, respectively. Engagement concave portions 6j, 6j are formed in portions of the pressure plate 6 facing the engagement convex portions 7j, 7j, and as shown in FIGS. Engage with 6j, 6j. At this time, the upper and lower ends of the engaging portion between the engaging convex portions 7j, 7j and the engaging concave portions 6j, 6j, that is, the urging force acting on the pressure plate 6,
Only the upper and lower end surfaces of the film contact surface 7m of the camera body 7 come into press contact with the upper and lower end surfaces of the pressure plate 6, and the engaging projections 7j, 7j
When the film 3 is fed so as to be inclined with respect to the film movement direction, the film side of the engagement protrusions 7j, 7j is prevented from contacting with the engagement recesses 6j, 6j. So that it hits the surface. The engaging recess
In the vicinity of the film cartridge accommodating chamber 7a side of 6j, 6j, inclined concave portions which are inclined so as to spread in the vertical direction, respectively, corresponding to the inclined portions 7e, 7f of the engaging convex portions 7j, 7j shown in FIG. (Not shown). Also, as shown in FIG. 1, the film cartridge storage chamber 7 of the upper and lower engagement recesses 6j, 6j.
In the vicinity of a, the inclined guide surfaces 8d, 8d are formed so as to spread in the thickness direction of the film 3 toward the film cartridge storage chamber side.
The film 3 is smoothly fed out from the entrance 1a of the camera. Further, a rectangular opening 8g similar to the opening 7g is formed in a portion of the film cartridge storage lid 8a near the pressure plate near the pressure plate, and a rectangular opening 8g of the film feeding roller 5 closer to the back lid than the opening 8g. A part of the film 3 is inserted into the film 3 so as to be in contact therewith, and the film 3 is sandwiched between the roller 4 and the roller 5 on the camera body side.
The film 3 sent from the film cartridge 1 is further fed to the take-up reel side by the rotation of.

According to the above configuration, in a camera of the type that automatically feeds the film 3 from the film cartridge 1, if the back cover 8 is closed after the film cartridge 1 is mounted in the film cartridge storage chamber 7a of the camera body 7,
The winding shaft 1b of the film cartridge 1 is driven to rotate in the film winding loosening direction, and the film 1 is pushed out from the entrance 1a. Further, the film 3 is inserted between the pressure plate 6 and the film contact surface 7m of the camera body 7 and comes into contact with the pair of rollers 4,5. It is taken up on the take-up reel 2 through the space between the contact surface 7m and the pressure plate 6. At this time, even if the film 3 receives a force in a direction perpendicular to the moving direction, the film 3 merely abuts on the film-side surface of one of the upper and lower engaging projections 7j, 7j, Since the film 3 does not enter into the engagement surface between the engagement recesses 6j, 7j and the engagement recesses 6j, 6j, the film 3 is smoothly fed in the moving direction.

According to the above embodiment, the engaging projections 7j, 7j formed at both ends of the film contact surface 7m of the camera body 7 in the direction orthogonal to the film moving direction are the opposite ends of the pressure plate 6 in the orthogonal direction. Since the engaging recesses 6j, 6j are formed in a nested manner, even if the film 3 is displaced in a direction orthogonal to the moving direction of the film 3, the engaging convex portions 7j, 7j And its movement is regulated. Accordingly, when the winding shaft 1b of the film cartridge 1 is rotated in the film winding loosening direction by the driving device (not shown) to start feeding the film 3 from the film cartridge 1, even if the leading end of the film 3 tends to shift with respect to the film moving direction. The movement is restricted by the engaging projections 7j, 7j, and the film 3 is guided only in the moving direction.
It is smoothly and reliably sent out and guided. That is,
Even if a force is applied to the film 3 in a direction perpendicular to the moving direction, the engaging protrusions 7j, 7j and the engaging recesses 6j, 6j are nested at both ends in the direction perpendicular to the moving direction of the film 3. Because it is engaged, it can not enter the engagement surface,
Since it merely abuts against the film-side surface of the engaging projections 7j, 7j, the moving resistance of the film 3 is reduced by entering between and engaging with the engaging projections 7j, 7j and the engaging recesses 6j, 6j. It is effectively prevented that the film 3 becomes large or that the movement of the film 3 becomes impossible.

Note that the present invention is not limited to the above-described embodiment, and can be implemented in various other modes. For example, as shown in FIGS. 8 and 9, while engaging projections 17j and 17j are formed on the film contact surface 17m side of the camera body 17, engagement recesses 16j and 16j are formed on the pressure plate 16 side. The same effects as described above may be achieved by engaging the engaging projections 16j, 16j in the engaging recesses 17j, 17j, respectively. Further, the shape of the opening 7g of the roller 4 of the camera body 7 is not limited to the shape in which the end surface on the take-up reel side is formed as a substantially rectangular inclined surface as shown in FIG. It may be formed in an opening 27g having a substantially triangular inclined surface as shown in FIG. 10, or as shown in FIG. 11, it has no inclined surface,
An opening 37g having a hypotenuse that allows the leading end of the film in contact with the end surface to move along with the feeding may be formed. First
In the case of the embodiment shown in FIG. 1, as in the case where the film is formed on an inclined surface, the leading end of the film can escape from the opening 37g while moving along the oblique side. In addition, the first
A synergistic effect may be exhibited by combining the inclined shape in the figure with the slope in FIG.

Further, not only the pressure plate 6 but also the lids 8a and 7e, 7f, 7j, 7j for the cartridge storage chamber and the lids 8b and 7j for the take-up reel storage chamber,
It is also desirable that the engagement between the points 7j is similarly uneven.

In addition, the height of the upper and lower ends of the pressure plate 6 and the portions in contact with the film contact surface 7m does not contact the apex of the engagement projection 7j and the bottom surface of the engagement recess 6j. Height can be the same. Thus, the focus of the film 3 on the lens is ensured by the distance relationship between the contact surface of the pressure plate 6 and the lens. The height position of the pressure plate 6 per film (the height of the protrusion 6k) and the camera By making the contact position between the main body (film contact surface) and the pressure plate (the height of the upper and lower ends of the pressure plate 6) the same, this distance relationship can be accurately maintained.

[Brief description of the drawings]

FIGS. 1 and 2 are cross-sectional views of a main part of a camera body and a back cover before and after a film is fed from a film cartridge in a camera using a film cartridge according to an embodiment of the present invention. FIG. 4 is a front view of the film contact surface of the camera body, FIG. 4 is a longitudinal sectional view of a main part of the film contact surface of the camera body and the pressure plate of the back cover,
FIG. 5 is an enlarged sectional view of a main part of FIG. 4, FIGS. 6 and 7 are respectively a transverse sectional view and a front view of a film feed roller opening of the camera body, and FIG. 8 is a camera body according to a modification of the present invention. 9 is an enlarged sectional view of a main part of the film contacting surface of the back cover and the pressure plate of the back cover, FIG. 9 is an enlarged cross-sectional view of the main part of FIG. 8, and FIGS. It is such a front view. DESCRIPTION OF SYMBOLS 1 ... Film cartridge, 1a ... Doorway, 1b ... Take-up shaft, 2 ... Take-up reel, 3 ... Film, 4, 5 ... Film delivery roller, 6 ... Press plate, 7 ... Camera body,
7a: film cartridge storage chamber, 7b: take-up reel storage chamber, 7c: exposure opening, 7d: inclined guide section, 7e, 7f
... Slope, 7g, 27g, 37g ... Opening, 7m ... Film contact surface, 8 ... Back cover, 8a ... Cover for film cartridge storage room, 8b ... Cover for take-up reel storage room, 8d ... Incline guide,
8g …… Opening, 9 …… Film cartridge rotation stop.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 3-24640 (JP, U) JP-A 58-163940 (JP, U) JP-A 53-5234 (JP, U) (58) Survey Field (Int.Cl. ⁶ , DB name) G03B 17/28

Claims (2)

(57) [Claims] 1. A film (3) having a winding shaft (1b) for winding a film (3) and a film inlet / outlet (1a) and containing the film (3) wound on the winding shaft (1b) in a light-shielded state. A camera using a film cartridge in which the film (3) is pushed out from the entrance (1a) by rotation of the winding shaft (1b) in the film winding loosening direction. (7c, 7g, 27g) formed along the line, and is located on the front side in the feeding direction of the film (3) among the peripheral portions defining the openings (7c, 7g, 27g). A peripheral portion is formed in a cross-sectional shape including an inclined surface approaching the film feed path toward the front in the film feed direction, and the opening (7c, 7g, 27g) is formed from the film feed path.
A camera using a film cartridge, wherein a front end portion of a film (3) fitted in the camera is returned to a film feeding path along the inclined surface. 2. A film (3) having a winding shaft (1b) for winding the film (3) and a film entrance (1a) and containing the film (3) wound on the winding shaft (1b) in a light-shielded state. A camera using a film cartridge in which the film (3) is pushed out from the entrance (1a) by rotation of the winding shaft (1b) in the film winding loosening direction. Has an opening (27g, 37g) formed along, and among the peripheral portions that define and define the openings (27g, 37g), the peripheral edge located on the front side in the feeding direction of the film (3) is: The leading end of the film (3), which is formed in a planar shape having a hypotenuse that is inclined with respect to the film feeding direction and fits into the openings (27g, 37g) from the film feeding path, is attached to the hypotenuse. And returned to the film feed path along Camera to use that film cartridge.